Description: Crustose alga, not calcareous but hard and thick.

Habitat: Very rare. Epilithic on small stones.

Distribution: Known from only a few sites in the British Isles. Further afield: Canary Islands.

Distribution Map from NBN: Peyssonnelia armorica at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Peyssonnelia armorica at iNaturalist World Species Observations database.

GBIF data for Peyssonnelia armorica

WoRMS: Peyssonnelia armorica at World Register of Marine Species. Accepted name: Peyssonnelia armorica (P.Crouan & H.Crouan) Weber Bosse, 1916. AphiaID: 145273.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Peyssonneliales; Peyssonneliaceae; Peyssonnelia